You are to fast every day, except Sundays, from the feast of the Exaltation of the Holy Cross until Easter Day, unless bodily sickness or feebleness, or some other good reason, demand a dispensation from the fast; for necessity overrides every law. Carmelite Rule - 16

God of Compassion, on this day of ashes and comfort for all remind me once more that I belong to You, that I come from You and to You I go. Open my heart, my mind, and my hands so that I may give You my sins, receive Your forgiveness, and recommit myself once more to love with tenderness, to act with justice, and to walk humbly by Your side. (from USCCB)